DVD Err(1208), Disc ID

I'm getting "DVD Err(1208), Disc ID" message on NeoGamma R9 b47 IOS249 (Rev 14) on backups that have previously worked. I have recently modded to play gamecube backups and those, as well as my wii backups, have worked great until about an hour ago. Now none of my wii or gamecube backups load at all. My wii is 4.2u... S#LU31... soft modded... games on dvd-r... good iso's... worked great until recently. Suggestions?

Correction: just popped in a game and it worked. I took it out, tried a few more and they did not work. Then I put the first game in again, the one that worked, and now it does not work. WTF?